Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos jogadores compareceram à SE missouri state?
 ###Tabelas: CREATE TABLE a-link_express (a-link_express_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Codename VARCHAR, Released VARCHAR, Fab ( nm ) INT, SATA VARCHAR, USB 2.0+1.1 VARCHAR, USB 3.0 VARCHAR, Parallel ATA 1 VARCHAR, RAID INT, Gb Ethernet MAC VARCHAR, Package VARCHAR, TDP ( W ) INT) CREATE TABLE current_codes (current_codes_id AUTO_INCREMENT PRIMARY KEY, Code VARCHAR, Subdivision name ( be ) (BGN/PCGN) VARCHAR, Subdivision name ( be ) (GOST) VARCHAR, Subdivision name ( ru ) (BGN/PCGN) VARCHAR, Subdivision name ( ru ) (GOST) VARCHAR, Subdivision category VARCHAR) CREATE TABLE topscorers_in_order_of_league_goals (topscorers_in_order_of_league_goals_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Club VARCHAR, League INT, FA Cup INT, FA Trophy INT, League Cup INT, Total INT) CREATE TABLE round_six (round_six_id AUTO_INCREMENT PRIMARY KEY, Pick # INT, CFL Team VARCHAR, Player VARCHAR, Position VARCHAR, School VARCHAR) CREATE TABLE third_line_series (third_line_series_id AUTO_INCREMENT PRIMARY KEY, Airing date VARCHAR, English title (Chinese title) VARCHAR, Number of episodes INT, Genre VARCHAR, Official website VARCHAR)  
SELECT COUNT Position FROM round_six WHERE School = SE Missouri State